Mareen "Peanut" Louie-Harper (born August 15, 1960) is a retired American tennis player, born in San Francisco, California to Ron and Alice Louie. She was a top-ranked junior tennis player and professional tennis player on the WTA tour. She reached a career high singles ranking of 19 in the world in 1985 and doubles ranking of 31 in the world in 1992. She is currently the co-founder and program director of Harper for Kids, a youth character development program. Professional tennis career During her career, she won 14 USTA National Junior titles and was the #1 ranked 16-and-under (1976) and 12-and-under tennis player (1972) in the United States. Peanut was the Junior Wimbledon finalist in 1977 and a semifinalist in 1978. She was also the #1 ranked junior in NorCal in all age divisions (10, 12, 14, 16 & 18 & unders). After a successful junior career, she turned pro in 1978. In her 16-year career, she won four singles titles and reached a career high ranking of No. 19 in the world (in 1985). She also won five doubles titles and reached a career high ranking of No. 31 in the world (in 1992). At the Grand Slams, her best results were reaching the round of 32 in singles and the round of 16 in doubles several times. Among her best wins were victories over Gabriela Sabatini, Zina Garrison, Mary Joe Fernandez, Helena Sukova, Wendy Turnbull, Stephanie Rehe and Andrea Jaeger. Louie was honored with the WTA Karen Krantzcke Sportsmanship Award in back-to-back years in 1985 and 1986 from the Women's Tennis Association (WTA). In 1986, she was also named Tennis magazine's Comeback Player of the Year. During her junior career, she was presented with the USTA Girls’ 18 National Championship Sportsmanship Award in 1977. Personal life and post-tennis career Her older sister Marcie also played on the WTA Tour, and her sisters Cici and Marisa, and brother Ronnie, all played at the University of San Francisco. She, along with her siblings, trained on the tennis courts of Golden Gate Park. She was given the nickname Peanut by her father because she was the youngest of the five children. She was inducted into the USTA Northern California Hall of Fame in 2000, the Multi-Ethnic Sports of Fame in 2017, the San Francisco Prep Hall of Fame in 2010, and the George Washington Athletic Hall of Fame in 1991. She